Final answer:
The DMLSS system's application used to request supplies is the Medical Logistics Application. This essential tool helps manage medical logistics within the Department of Defense.
Step-by-step explanation:
Once you have gained access to the Defense Medical Logistics Standard Support (DMLSS), the system's application you can use to request supplies is c) Medical Logistics Application. The DMLSS is a digital tool designed to help the medical logistics community efficiently manage and track medical and surgical supplies, equipment, and services. This comprehensive platform is key to ensuring that medical facilities within the Department of Defense have the essential resources necessary to provide care to service members.